CVE-2021-30508
📋 TL;DR
This vulnerability is a heap buffer overflow in Google Chrome's Media Feeds feature that allows an attacker to potentially exploit heap corruption. Attackers could execute arbitrary code or crash the browser by convincing users to enable certain features and visit a crafted HTML page. All users of affected Chrome versions are at risk.
💻 Affected Systems
- Google Chrome
- Chromium-based browsers
📦 What is this software?
Chrome by Google
Google Chrome is the world's most popular web browser, used by over 3 billion users globally across Windows, macOS, Linux, Android, and iOS platforms. As a Chromium-based browser developed by Google, Chrome dominates the browser market with approximately 65% market share, making it a critical compon...
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⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to full system compromise, data theft, or malware installation.
Likely Case
Browser crash (denial of service) or limited code execution within browser sandbox.
If Mitigated
No impact if Chrome is updated to patched version or Media Feeds feature is disabled.
🎯 Exploit Status
Exploitation requires user to enable Media Feeds feature and visit malicious page. No public exploit code known.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 90.0.4430.212 and later
Vendor Advisory: https://chromereleases.googleblog.com/2021/05/stable-channel-update-for-desktop.html
Restart Required: Yes
Instructions:
1. Open Chrome. 2. Click menu (three dots) → Help → About Google Chrome. 3. Chrome will automatically check for and install updates. 4. Click Relaunch to restart Chrome.
🔧 Temporary Workarounds
Disable Media Feeds
allTurn off the Media Feeds feature that contains the vulnerability
Navigate to chrome://flags/#enable-media-feeds and set to Disabled
🧯 If You Can't Patch
- Disable Media Feeds feature via chrome://flags
- Use browser extensions to block malicious content and restrict JavaScript execution
🔍 How to Verify
Check if Vulnerable:
Check Chrome version: if version is below 90.0.4430.212, system is vulnerable.Check Version:
google-chrome --version (Linux) or open chrome://version in browserVerify Fix Applied:
Confirm Chrome version is 90.0.4430.212 or higher.📡 Detection & Monitoring
Log Indicators:
- Chrome crash reports
- Unexpected process termination
- Memory access violation errors
Network Indicators:
- Requests to unusual domains with crafted HTML content
- Suspicious iframe or script loads
SIEM Query:
source="chrome" AND (event="crash" OR event="access_violation") AND version<"90.0.4430.212"🔗 References
- https://chromereleases.googleblog.com/2021/05/stable-channel-update-for-desktop.html
- https://crbug.com/1195340
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ETMZL6IHCTCTREEL434BQ4THQ7EOHJ43/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PAT6EOXVQFE6JFMFQF4IKAOUQSHMHL54/
- https://security.gentoo.org/glsa/202107-06
- https://chromereleases.googleblog.com/2021/05/stable-channel-update-for-desktop.html
- https://crbug.com/1195340
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ETMZL6IHCTCTREEL434BQ4THQ7EOHJ43/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PAT6EOXVQFE6JFMFQF4IKAOUQSHMHL54/
- https://security.gentoo.org/glsa/202107-06
